@incollection{jansen2012scheduling,
  title={Scheduling jobs on identical and uniform processors revisited},
  author={Jansen, Klaus and Robenek, Christina},
  booktitle={Approximation and Online Algorithms},
  pages={109--122},
  year={2012},
  publisher={Springer}
}

@book{jansen2008approximative,
  title={Approximative Algorithmen und Nichtapproximierbarkeit},
  author={Jansen, Klaus and Margraf, Marian},
  year={2008},
  publisher={Walter de Gruyter}
}